Home connect zoom fiber

I'm having a problem getting my router working the accounts department keep sending me the statement that I owe them and I've sent all the proof of payments that I've Eft to them. My wrong was that I forgot to put the right reference number but my details appears on the statement sent from my Capitec bank. I made a payment of R600 the one that they tend to ignore and on the 9th June I Eft R500 so I've a balance of R18 but they keep threatening to terminate their services because of their non competency. Kindly intervene my reference with them is LEBJ003